<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        function show(a,b){
            var a=4;
            var b=3;
            alert(a+b);
            function show2(c,d){
                alert(c+d)
            }
            return show2(a,b)
        }
        alert(show(1,2))
    </script>
</head>
<body>

</body>
</html>















